package com.example.demo.common;


import com.example.demo.entity.Userinfo;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

/**
 *  当前登录用户的相关操作.
 */
public class UserSessionUtils {
    /**
     * 拿到用户登录对象
     */
    public static Userinfo getUser(HttpServletRequest request) {
        HttpSession session = request.getSession(false);
        if (session != null && session.getAttribute(AppVariable.USER_SESSION_KEY) != null) {
            // 已经登录
            return (Userinfo)session.getAttribute(AppVariable.USER_SESSION_KEY);
        }

        // 未登录 返回一个 null
        return null;
    }
}
